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INFLUENCE OF MEASUREMENT EQUIPMENT ON THE UNCERTAINTY OF PERFORMANCE DATA FROM TEST LOOPS FOR CONCENTRATING SOLAR COLLECTORS

Lüpfert, Eckhard and Pitz-Paal, R. and Pottler, Klaus and Eck, Markus and Zarza, E. and Riffelmann, K.-J. (2010) INFLUENCE OF MEASUREMENT EQUIPMENT ON THE UNCERTAINTY OF PERFORMANCE DATA FROM TEST LOOPS FOR CONCENTRATING SOLAR COLLECTORS. Journal of Solar Energy Engineering, 132 (3). American Society of Mechanical Engineers. DOI: 10.1115/1.4001476. ISSN 0199-6231.

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Abstract

Parabolic trough concentrating collectors play a major role in the energy efficiency and economics of concentrating solar power plants. Therefore, existing collector systems are constantly enhanced and new types developed. Thermal performance testing is one step generally required in the course of their testing and qualification. For outdoor tests of prototypes a heat transfer fluid loop (single collector or entire loop) needs to be equipped with measurement sensors for inlet, outlet and ambient temperature as well as irradiance, wind speed and mass or volumetric flow rate to evaluate the heat balance. Assessing the individual measurement uncertainties and their impact on the combined uncertainty of the desired measurement quantity one obtains the significance of the testing results. The method has been applied to a set of EuroTrough collector tests performed at Plataforma Solar de Almería (PSA). Test results include the uncertainty range of the resulting modeling function and exemplify the effects of sensors and their specifications on the parameters leading to an uncertainty of ±1.7%-points for the optical collector efficiency. Measurement uncertainties of direct normal irradiance and mass flow rate are identified as determining uncertainty contributions and indicate room for improvement. Extended multiple sensor deployment and improved calibration procedures are the key to further reducing measurement uncertainty and hence increasing testing significance.

Document Type:Article
Title:INFLUENCE OF MEASUREMENT EQUIPMENT ON THE UNCERTAINTY OF PERFORMANCE DATA FROM TEST LOOPS FOR CONCENTRATING SOLAR COLLECTORS
Authors:
AuthorsInstitution or Email of Authors
Lüpfert, EckhardUNSPECIFIED
Pitz-Paal, R.UNSPECIFIED
Pottler, KlausUNSPECIFIED
Eck, MarkusUNSPECIFIED
Zarza, E.CIEMAT
Riffelmann, K.-J.UNSPECIFIED
Date:August 2010
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:132
DOI:10.1115/1.4001476
Editors:
EditorsEmail
Flamant, GillesUNSPECIFIED
Publisher:American Society of Mechanical Engineers
ISSN:0199-6231
Status:Published
Keywords:parabolic trough, extended prototype testing, efficiency, thermal measurement, measurement uncertainty, combined uncertainty, qualification
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Nicole Janotte
Deposited On:21 Jan 2011 15:27
Last Modified:04 Apr 2013 16:27

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